Uneconomically is an adverb that describes an action or a situation that is not cost-effective or not efficient. Some synonyms for uneconomically are wastefully, inefficiently, extravagantly, immoderately, and profligately. Wastefully refers to the excessive use of resources or money without any significant benefit. Inefficiently means not achieving the desired results with the available resources. Extravagantly describes a situation where money or resources are spent on unnecessary or non-essential items. Immoderately means doing something excessively or beyond the necessary limit. Profligately means spending money or resources recklessly without any regard for the consequences. These synonyms can be used interchangeably depending on the context to indicate a lack of efficiency or cost-effectiveness.